1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Hunter-Best [27]
2 years ago
14

I'LL GIVE BRAINLIST

Biology
1 answer:
hichkok12 [17]2 years ago
4 0
Wi-Fi technology has its origins in a 1985 ruling by the U.S. Federal Communications Commission that released the bands of the radio spectrum at 900 megahertz (MHz), 2.4 gigahertz (GHz), and 5.8 GHz for unlicensed use by anyone. Technology firms began building wireless networks and devices to take advantage of the newly available radio spectrum, but without a common wireless standard the movement remained fragmented, as devices from different manufacturers were rarely compatible. Eventually, a committee of industry leaders came up with a common standard, called 802.11, which was approved by the Institute of Electrical and Electronics Engineers (IEEE) in 1997. Two years later a group of major companies formed the Wireless Ethernet Compatibility Alliance (WECA, now the Wi-Fi Alliance), a global nonprofit organization created to promote the new wireless standard. WECA named the new technology Wi-Fi. Subsequent IEEE standards for Wi-Fi have been introduced to allow for greater bandwidth. The original 802.11 standard allowed a maximum data transmission rate of only 2 megabits per second (Mbps); 802.11n, introduced in 2007, has a maximum rate of 600 Mbps.

Under the IEEE Wi-Fi standards, the available frequency bands are split into several separate channels. These channels overlap in frequency, and therefore Wi-Fi uses channels that are far apart. Within each of these channels, Wi-Fi uses a “spread spectrum” technique in which a signal is broken into pieces and transmitted over multiple frequencies. Spread spectrum enables the signal to be transmitted at a lower power per frequency and also allows multiple devices to use the same Wi-Fi transmitter. Because Wi-Fi signals are often transmitted over short distances (usually less than 100 metres [330 feet]) in indoor environments, the signal can reflect off walls, furniture, and other obstacles, thus arriving at multiple time intervals and causing a problem called multipath interference. Wi-Fi reduces multipath interference by combining three different ways of transmitting the signal (in a method developed by Australian engineer John O’Sullivan and collaborators). The popularity of Wi-Fi has grown steadily. Wi-Fi allows local area networks (LANs) to operate without cables and wiring, making it a popular choice for home and business networks. Wi-Fi can also be used to provide wireless broadband Internet access for many modern devices, such as laptops, smartphones, tablet computers, and electronic gaming consoles. Wi-Fi-enabled devices are able to connect to the Internet when they are near areas that have Wi-Fi access, called “hot spots.” Hot spots have become common, with many public places such as airports, hotels, bookstores, and coffee shops offering Wi-Fi access. Some cities have constructed free citywide Wi-Fi networks. A version of Wi-Fi called Wi-Fi Direct allows connectivity between devices without a LAN. Radiotelegraphy, radio communication by means of Morse Code or other coded signals. The radio carrier is modulated by changing its amplitude, frequency, or phase in accordance with the Morse dot-dash system or some other code. At the receiver the coded modulation is recovered by an appropriate demodulator and the code groups are converted into the corresponding symbols. In many instances the symbols are generated by a computer and modem rather than with a manual telegraph key.
You might be interested in
CAN SOMEONE PLEASEEE HELP ME WITH THIS SCIENCE QUESTION THANK YOU !!​
dedylja [7]

Answer:

The answer is D.

Explanation:

Farmers have to continuously use the pesticides once used the first time because they have become an indispensable part of an agricultural cycle.

#teamtrees #WAP (Water And Plant)

6 0
2 years ago
Does Darwin’s theory of Nature selection explain how evolution occurs ?
Alenkasestr [34]
Yes Darwin’s theory of natural selection
3 0
3 years ago
Which two kinds of information can scientists gather using radar?
makkiz [27]

The correct answers are C. Amount of rainfall, and D. Wind speed.

Explanation

Radars are instruments that were created by humans to detect objects, people, places, among others, through signals. Radars are devices used in different fields such as war, aviation, climatology, geography, among others. One of the best known is the Doppler radar, which is a climatological tool that is used to detect the intensity, size, quantity, and direction of rainfall. Likewise, rainfall is influenced by the direction and speed of the wind, data that can also be obtained using this tool. One of the purposes for which this object was created was the early detection of natural phenomena related to rains, and winds such as hurricanes, electric storms, hail, among others. Therefore, the two objects that scientists can obtain with a radar are C. Amount of rainfall, and D. Wind speed.

4 0
3 years ago
Environmental science exam.
Lapatulllka [165]
Actually the answer is none of the answers
They are all transfer of heat in many ways
4 0
2 years ago
Nothing is exempt from ________, which states the total energy remains constant during a physical change.
OLEGan [10]
Newton's Law of Motion
6 0
3 years ago
Read 2 more answers
Other questions:
  • What is the best evidence that two organism share a common evolutionary ancesery
    5·1 answer
  • In general it is expected that ________. select one:
    6·1 answer
  • The afrikaner population of dutch settlers in south africa is descended mainly from a few colonists. today, the afrikaner popula
    5·2 answers
  • Compare at least two characteristics of mitochondria to prokaryotic cells and explain how this relates to the endosymbiotic theo
    10·1 answer
  • Jessica's mother has the blood type AB and her father has the blood type O. Which blood type could Jessica have? Draw a Punnett
    6·1 answer
  • Which of the following releases energy? (4 points)
    6·2 answers
  • Comparison between a plant cell and cell organelles
    10·2 answers
  • Base your answer to this question on the following information: You have isolated a primary signal factor from the blood of a sp
    9·1 answer
  • Structures in the cell
    12·2 answers
  • The movement of tectonic plates in two locations is described below:
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!